Definitely pick the first one. The thing about the second one is that it has
no relevance to the background and the outer space climatic theme. The
cartoon-ish chick is just like in the middle of space like, "Wtf am I doing here"?
I admire you for trying to make it look nice, because you had a nice concept
going. Just choose a different centerpiece if you would like to reuse the
background.